diff --git a/public/sounds/default.wav b/public/sounds/default.wav
index e69de29b..59238b1b 100644
Binary files a/public/sounds/default.wav and b/public/sounds/default.wav differ
diff --git a/public/sounds/push_notification.wav b/public/sounds/push_notification.wav
index e69de29b..59238b1b 100644
Binary files a/public/sounds/push_notification.wav and b/public/sounds/push_notification.wav differ
diff --git a/public/sounds/sam_voice.wav b/public/sounds/sam_voice.wav
new file mode 100644
index 00000000..59238b1b
Binary files /dev/null and b/public/sounds/sam_voice.wav differ
diff --git a/src/components/settings/NotificationSettings/index.tsx b/src/components/settings/NotificationSettings/index.tsx
index 4aaa7739..e4d0ba9d 100644
--- a/src/components/settings/NotificationSettings/index.tsx
+++ b/src/components/settings/NotificationSettings/index.tsx
@@ -29,13 +29,26 @@ import { saveNotificationSettings } from './actions';
 import { ItemSettingsDialog } from './ItemSettingsDialog';
 
 // 미리듣기 함수
+let previewAudio: HTMLAudioElement | null = null;
+
 function playPreviewSound(soundType: SoundType) {
   if (soundType === 'mute') {
     toast.info('무음으로 설정되어 있습니다.');
     return;
   }
-  const soundName = soundType === 'default' ? '기본 알림음' : 'SAM 보이스';
-  toast.info(`${soundName} 미리듣기`);
+
+  // 이전 재생 중지
+  if (previewAudio) {
+    previewAudio.pause();
+    previewAudio = null;
+  }
+
+  const soundFile = soundType === 'sam_voice' ? 'sam_voice.wav' : 'default.wav';
+  previewAudio = new Audio(`/sounds/${soundFile}`);
+  previewAudio.play().catch(() => {
+    const soundName = soundType === 'default' ? '기본 알림음' : 'SAM 보이스';
+    toast.info(`${soundName} 미리듣기`);
+  });
 }
 
 // 알림 항목 컴포넌트
diff --git a/src/components/settings/NotificationSettings/types.ts b/src/components/settings/NotificationSettings/types.ts
index b9b878e6..c5290b53 100644
--- a/src/components/settings/NotificationSettings/types.ts
+++ b/src/components/settings/NotificationSettings/types.ts
@@ -1,33 +1,12 @@
 /**
  * 알림 설정 타입 정의
  *
- * ========================================
- * [2026-01-05] 백엔드 API 수정 필요 사항
- * ========================================
+ * API 응답 구조: { enabled, email, soundType } per item
+ * soundType: 'default' | 'sam_voice' | 'mute'
  *
- * 1. NotificationItem에 soundType 필드 추가
- *    - 기존: { enabled: boolean, email: boolean }
- *    - 변경: { enabled: boolean, email: boolean, soundType: 'default' | 'sam_voice' | 'mute' }
- *
- * 2. OrderNotificationSettings에 approvalRequest 항목 추가
- *    - 기존: { salesOrder, purchaseOrder }
- *    - 변경: { salesOrder, purchaseOrder, approvalRequest }
- *
- * 3. API 응답 예시:
- *    {
- *      "notice": {
- *        "enabled": true,
- *        "notice": { "enabled": true, "email": false, "soundType": "default" },
- *        "event": { "enabled": true, "email": true, "soundType": "sam_voice" }
- *      },
- *      "order": {
- *        "enabled": true,
- *        "salesOrder": { ... },
- *        "purchaseOrder": { ... },
- *        "approvalRequest": { "enabled": false, "email": false, "soundType": "default" }  // 새로 추가
- *      }
- *    }
- * ========================================
+ * [2026-03-18] soundType API 연동 완료
+ * - API가 settings JSON 컬럼의 sound_type 키로 저장/반환
+ * - 음원 파일: public/sounds/default.wav, sam_voice.wav
  */
 
 // 알림 소리 타입 (NEW: 2026-01-05)