This study investigates coastal morphological changes induced by artificial island construction through an integrated analysis of Riyue Bay, a relatively flat bay with a continuous stretch of sandy beach. There are no major rivers flowing into the sea along the coast, and the shoreline has remained relatively stable for a long time. However, in the 10 years since 2012, artificial island projects such as Sun Island and Moon Island have been developed along the coast. A tombolo has formed connecting Sun Island, causing severe erosion on the beaches to the north and south. In this context, a restoration project primarily focused on offshore submerged breakwaters and artificial nourishment was studied and implemented. In the later stage, the illegally reclaimed Moon Island was also removed to a depth of 4 m below the average sea level. In the short term, intensive manual construction, repair, and demolition have caused significant erosion and sedimentation changes on the beach.