Sandøya is an island in Ålesund Municipality in Møre og Romsdal county, Norway.

The highest point on the island is the 36-metre (118 ft) tall hill Bustihaugen.

During summer, taking the bike to the island's sand beaches is a popular attraction.

On 30 January 2025, the Norwegian County Governor announced his administration had greenlit a local authority swap for the islands of Ona and Sandøy.

Ironically, the decision rescinds Paul Knudsen Gaasø's 1860 quest to gain local independence for the islands of Sandøy, Ona, Orten and Harøy from Aukra.