Sandstone Island is a small island located approximately one kilometre southeast of the Hastings foreshore in Western Port, Victoria, Australia. Sandstone Island has an area of approximately 20 hectares and is adjacent to Jacks Beach. The island lies in an area where significant mangrove communities exist. The Island itself is quite devoid of significant vegetation, however its location in an environmentally significant area in Western Port, places particular emphasis on ensuring appropriate use and development on the Island. The Island currently is in single ownership.
Like French Island, Sandstone Island is an unincorporated area of Victoria and both are subject to the French Island and Sandstone Island Planning Scheme.