Sotome (外海町 Sotome-chō) was a town located in Nishisonogi District, Nagasaki, Japan.
As of 2003, the town had an estimated population of 5,412 and a density of 116.09 persons per km². The total area was 46.62 km².
On January 4, 2005 Sotome, along with the towns of Iōjima, Kōyagi, Nomozaki, Sanwa and Takashima, all from Nishisonogi District, was merged into the expanded city of Nagasaki and no longer exists as an independent municipality.