This study analyzes shoreline changes in the Tam Quan estuary, Vietnam, characterized by a unique asymmetrical morphology with a rocky headland to the north and a sand spit to the south. Historically, shoreline shifts were driven by seasonal variations in wave energy and sediment transport. However, the construction of a jetty in 2004 introduced a significant anthropogenic influence. Traditional methods of extracting shorelines from satellite imagery are labor-intensive and subjective. To overcome these limitations, this study utilizes CoastSat, an open-source tool integrated with Google Earth Engine (GEE), to automate shoreline extraction from a vast archive of imagery spanning from 1988 to the present. This approach facilitates the creation of a comprehensive shoreline database, enabling analysis of shoreline changes before and after jetty construction. Initial findings indicate that the jetty has significantly altered shoreline dynamics, causing accretion along the southern shoreline. This study provides valuable insights into the morphological response of the estuary to the jetty construction. The results can inform the planning and management of future estuarine training projects in the Tam Quan region and other similar environments, promoting sustainable coastal development and mitigating potential adverse impacts.