diff --git a/app/Http/Controllers/ESign/EsignApiController.php b/app/Http/Controllers/ESign/EsignApiController.php
index 005ae234..2f6be04e 100644
--- a/app/Http/Controllers/ESign/EsignApiController.php
+++ b/app/Http/Controllers/ESign/EsignApiController.php
@@ -827,11 +827,13 @@ public function send(Request $request, int $id): JsonResponse
         $sendMethod = $request->input('send_method', 'email');
         $smsFallback = $request->boolean('sms_fallback', true);
         $templateName = $request->input('template_name');
+        $completionTemplateName = $request->input('completion_template_name');
 
         $contract->update([
             'status' => 'pending',
             'send_method' => $sendMethod,
             'sms_fallback' => $smsFallback,
+            'completion_template_name' => $completionTemplateName,
             'updated_by' => auth()->id(),
         ]);
 
@@ -1090,6 +1092,20 @@ private function sendAlimtalk(
             }
             unset($btn);
 
+            // 버튼 URL 도메인을 현재 환경의 도메인으로 치환
+            $appHost = parse_url(config('app.url'), PHP_URL_HOST);
+            foreach ($buttons as &$btn) {
+                foreach (['Url1', 'Url2'] as $urlKey) {
+                    if (! empty($btn[$urlKey])) {
+                        $parsed = parse_url($btn[$urlKey]);
+                        if (isset($parsed['host']) && $parsed['host'] !== $appHost) {
+                            $btn[$urlKey] = str_replace($parsed['host'], $appHost, $btn[$urlKey]);
+                        }
+                    }
+                }
+            }
+            unset($btn);
+
             $receiverNum = preg_replace('/[^0-9]/', '', $signer->phone);
 
             \Log::info('E-Sign 알림톡 발송 시도', [
diff --git a/app/Http/Controllers/ESign/EsignPublicController.php b/app/Http/Controllers/ESign/EsignPublicController.php
index 6a86563f..7270f579 100644
--- a/app/Http/Controllers/ESign/EsignPublicController.php
+++ b/app/Http/Controllers/ESign/EsignPublicController.php
@@ -754,7 +754,8 @@ private function sendCompletionAlimtalk(EsignContract $contract, EsignSigner $si
                 return ['success' => false, 'channel' => 'alimtalk', 'error' => '등록된 카카오톡 채널이 없습니다'];
             }
 
-            $templateName = $this->resolveTemplateName('전자계약_완료');
+            $templateName = $contract->completion_template_name
+                ?: $this->resolveTemplateName('전자계약_완료');
             $documentUrl = config('app.url').'/esign/sign/'.$signer->access_token.'/api/document';
             $signUrl = config('app.url').'/esign/sign/'.$signer->access_token;
             $completedAt = $contract->completed_at?->format('Y-m-d H:i') ?? now()->format('Y-m-d H:i');
@@ -807,6 +808,20 @@ private function sendCompletionAlimtalk(EsignContract $contract, EsignSigner $si
             }
             unset($btn);
 
+            // 버튼 URL 도메인을 현재 환경의 도메인으로 치환
+            $appHost = parse_url(config('app.url'), PHP_URL_HOST);
+            foreach ($buttons as &$btn) {
+                foreach (['Url1', 'Url2'] as $urlKey) {
+                    if (! empty($btn[$urlKey])) {
+                        $parsed = parse_url($btn[$urlKey]);
+                        if (isset($parsed['host']) && $parsed['host'] !== $appHost) {
+                            $btn[$urlKey] = str_replace($parsed['host'], $appHost, $btn[$urlKey]);
+                        }
+                    }
+                }
+            }
+            unset($btn);
+
             $receiverNum = preg_replace('/[^0-9]/', '', $signer->phone);
 
             Log::info('E-Sign 완료 알림톡 발송 시도', [
diff --git a/app/Models/ESign/EsignContract.php b/app/Models/ESign/EsignContract.php
index e4611cc7..47e863a5 100644
--- a/app/Models/ESign/EsignContract.php
+++ b/app/Models/ESign/EsignContract.php
@@ -27,6 +27,7 @@ class EsignContract extends Model
         'status',
         'send_method',
         'sms_fallback',
+        'completion_template_name',
         'metadata',
         'expires_at',
         'completed_at',
diff --git a/resources/views/esign/send.blade.php b/resources/views/esign/send.blade.php
index 5be98c0e..2e412593 100644
--- a/resources/views/esign/send.blade.php
+++ b/resources/views/esign/send.blade.php
@@ -39,6 +39,8 @@
     const [templateLoading, setTemplateLoading] = useState(false);
     const [templateError, setTemplateError] = useState('');
     const [templatePreview, setTemplatePreview] = useState(null);
+    const [selectedCompletionTemplate, setSelectedCompletionTemplate] = useState('');
+    const [completionTemplatePreview, setCompletionTemplatePreview] = useState(null);
 
     const fetchContract = useCallback(async () => {
         try {
@@ -57,6 +59,8 @@
         setTemplates([]);
         setSelectedTemplate('');
         setTemplatePreview(null);
+        setSelectedCompletionTemplate('');
+        setCompletionTemplatePreview(null);
         try {
             const res = await fetch('/esign/contracts/alimtalk-templates', { headers: getHeaders() });
             const json = await res.json();
@@ -92,6 +96,7 @@
                     send_method: sendMethod,
                     sms_fallback: smsFallback,
                     template_name: (sendMethod === 'alimtalk' || sendMethod === 'both') ? selectedTemplate : undefined,
+                    completion_template_name: (sendMethod === 'alimtalk' || sendMethod === 'both') ? selectedCompletionTemplate : undefined,
                 }),
             });
             const json = await res.json();
@@ -178,10 +183,10 @@ className="rounded text-blue-600 focus:ring-blue-500" />
                     </label>
                 )}
 
-                {/* 알림톡 템플릿 선택 */}
+                {/* 서명 요청 알림톡 템플릿 선택 */}
                 {needsAlimtalk && (
                     <div className="mt-4 p-4 bg-gray-50 rounded-lg border border-gray-200">
-                        <label className="block text-sm font-medium text-gray-700 mb-2">알림톡 템플릿 선택</label>
+                        <label className="block text-sm font-medium text-gray-700 mb-2">서명 요청 알림톡 템플릿</label>
                         {templateLoading ? (
                             <div className="text-sm text-gray-400 py-2">템플릿 목록 조회 중...</div>
                         ) : templateError ? (
@@ -223,6 +228,42 @@ className="w-full px-3 py-2 border border-gray-300 rounded-lg text-sm focus:ring
                         )}
                     </div>
                 )}
+
+                {/* 완료 알림톡 템플릿 선택 */}
+                {needsAlimtalk && !templateLoading && !templateError && templates.length > 0 && (
+                    <div className="mt-4 p-4 bg-gray-50 rounded-lg border border-gray-200">
+                        <label className="block text-sm font-medium text-gray-700 mb-2">완료 알림톡 템플릿</label>
+                        <p className="text-xs text-gray-500 mb-2">모든 서명자 서명 완료 시 발송될 알림톡 템플릿을 선택하세요.</p>
+                        <select
+                            value={selectedCompletionTemplate}
+                            onChange={e => {
+                                setSelectedCompletionTemplate(e.target.value);
+                                const tpl = templates.find(t => t.name === e.target.value);
+                                setCompletionTemplatePreview(tpl || null);
+                            }}
+                            className="w-full px-3 py-2 border border-gray-300 rounded-lg text-sm focus:ring-blue-500 focus:border-blue-500"
+                        >
+                            <option value="">-- 선택 안함 (기본 템플릿 사용) --</option>
+                            {templates.map(t => (
+                                <option key={t.name} value={t.name}>{t.name}</option>
+                            ))}
+                        </select>
+
+                        {completionTemplatePreview && (
+                            <div className="mt-3 p-3 bg-white border border-gray-200 rounded-lg">
+                                <p className="text-xs font-medium text-gray-500 mb-2">미리보기</p>
+                                <pre className="text-xs text-gray-700 whitespace-pre-wrap leading-relaxed">{completionTemplatePreview.content}</pre>
+                                {completionTemplatePreview.buttons?.length > 0 && (
+                                    <div className="mt-2 pt-2 border-t border-gray-100">
+                                        {completionTemplatePreview.buttons.map((btn, i) => (
+                                            <span key={i} className="inline-block px-3 py-1 mr-1 text-xs bg-yellow-100 text-yellow-800 rounded">{btn.Name}</span>
+                                        ))}
+                                    </div>
+                                )}
+                            </div>
+                        )}
+                    </div>
+                )}
             </div>
 
             {/* 서명자 연락처 확인 */}