Map - Sandøy

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.

At the time if its dissolution in 2020, the 21 km2 municipality is the 416th largest by area out of the 422 municipalities in Norway. Sandøy is the 371st most populous municipality in Norway with a population of 1,263. The municipality's population density is 59.1 PD/km2 and its population has decreased by 1.4% over the last decade.

The municipality of Sandø i Romsdal was established on 1 January 1867 when it was separated from Akerø Municipality. The initial population was 601. The spelling of the name was later changed to Sandøy. During the 1960s, there were many municipal mergers across Norway due to the work of the Schei Committee. On 1 January 1965, the Myklebost area on Harøya island and some smaller islands to the west (population: 287) were transferred from Haram Municipality to Sandøy Municipality.

On 1 January 2020, the municipality of Sandøy was dissolved. The islands of Orta and Lyngværet (and the small surrounding islands) were merged into Aukra Municipality. The remainder of the old Sandøy Municipality was merged with Haram Municipality, Ørskog Municipality, Skodje Municipality, and Ålesund Municipality to form one large municipality of Ålesund.