Sandoy (Danish: Sandø. English: Sandisland) is the first of the five southern islands that make up the Faroe chain, the fifth biggest of all the Faroe Islands, an autonomous region of the Kingdom of Denmark. It also refers to the region that includes this island along with Skúvoy and Stóra Dímun. As of 2011[update], the largest population center on the island is the village of Sandur with a population of 599. Other settlements include Skarvanes, Skopun, Skálavík, Húsavík and Dalur.
The island is considered the best island for agriculture due to its fertile sandy soil. The largest potato farm in the country is located on the island. And people who have gardening interests have generally an easier time getting plants to grow here.
On 19 August 2015 the agricultural union "Veltan" was founded for people who have an interest in gardening and farming, their aim is to improve conditions for a self-sustaining way of life, and agricultural businesses.
The island supports 6,878 sheep, not including lambs.
The island's surrounding bird cliffs and steep slopes have been identified as an Important Bird Area (IBA) by BirdLife International because of their significance as a breeding site for seabirds, especially northern fulmars (50,000 pairs), Manx shearwaters (5000 pairs), European storm petrels (50,000 pairs), European shags (150 pairs), great skuas (15 pairs), Atlantic puffins (70,000 pairs) and black guillemots (400 pairs). An additional IBA on the island comprises the lowland areas around the village of Sandur, with their moorland and peat bogs, and the lakes Gróthúsvatn, Lítlavatn, Sandsvatn and Stóravatn, because they support 100-150 breeding pairs of whimbrels.
The lake Sandsvatn is the largest on the island and the third largest in the Faroe Islands.