Sandøy is a former municipality in Møre og Romsdal county, Norway. It was part of the Romsdal region. The administrative centre was the village of Steinshamn. Other villages included Ona and Myklebost. The municipality was spread out over many islands in the mouth of the vast Romsdal Fjord. The Flatflesa Lighthouse and Ona Lighthouse protect the boats traveling around the municipality. The Nordøy Fixed Link project was constructed from 2018 until 2023 and it includes three undersea tunnels and several bridges that will connect the main islands of Sandøy Municipality and the islands of Haram Municipality to the mainland.