Sandy Cave (Japanese: 浜辺の洞穴 Beach Cave) is a location on Melemele Island in Alola. There is an entrance to the cave on Big Wave Beach. It only appears in Pokémon Ultra Sun and Ultra Moon.
This is a small cave to the south of Big Wave Beach. It is mostly filled with water, and contains a few items. Lapras Paddle, Sharpedo Jet, and Machamp Shove are required to fully explore the area.