diff --git a/backend/app/api/verification.py b/backend/app/api/verification.py
index 9eaf9df..408ded1 100644
--- a/backend/app/api/verification.py
+++ b/backend/app/api/verification.py
@@ -185,8 +185,11 @@ async def send_preregister_email_code(
     db: Session = Depends(get_db)
 ):
     """Send email verification code for new registration (no login required)"""
-    # Check if email is already registered
-    existing = db.query(User).filter(User.email == request.email).first()
+    # Check if email is already registered (삭제된 사용자는 제외)
+    existing = db.query(User).filter(
+        User.email == request.email,
+        User.deleted_at.is_(None)  # 삭제되지 않은 사용자만 체크
+    ).first()
     if existing:
         raise HTTPException(
             status_code=status.HTTP_400_BAD_REQUEST,