Sand Cay, also known as Bailan Island and Son Ca Island, is a cay on the north edge of the Tizard Bank of the Spratly Islands in the South China Sea. With an area of 7 hectares, it is the ninth largest, and the fourth largest Vietnamese-administered, of the Spratly Islands. The island has been occupied by Vietnam since 1974. It is also claimed by China (PRC), the Philippines, Vietnam, and Taiwan (ROC).