diff --git a/src/sagemaker/image_uri_config/model-monitor.json b/src/sagemaker/image_uri_config/model-monitor.json
index 2aa2022163..6a6119a330 100644
--- a/src/sagemaker/image_uri_config/model-monitor.json
+++ b/src/sagemaker/image_uri_config/model-monitor.json
@@ -11,6 +11,7 @@
                 "ap-south-1": "126357580389",
                 "ap-southeast-1": "245545462676",
                 "ap-southeast-2": "563025443158",
+                "ap-southeast-3": "669540362728",
                 "ca-central-1": "536280801234",
                 "cn-north-1": "453000072557",
                 "cn-northwest-1": "453252182341",
diff --git a/tests/unit/sagemaker/image_uris/test_model_monitor.py b/tests/unit/sagemaker/image_uris/test_model_monitor.py
index e8d9f2f19c..b828c1bbe5 100644
--- a/tests/unit/sagemaker/image_uris/test_model_monitor.py
+++ b/tests/unit/sagemaker/image_uris/test_model_monitor.py
@@ -24,6 +24,7 @@
     "ap-south-1": "126357580389",
     "ap-southeast-1": "245545462676",
     "ap-southeast-2": "563025443158",
+    "ap-southeast-3": "669540362728",
     "ca-central-1": "536280801234",
     "cn-north-1": "453000072557",
     "cn-northwest-1": "453252182341",