Career
Born in Runavík, Thomsen began his senior career in 2005 with NSÍ Runavík, and has also played for ÍF Fuglafjørður, B68 Toftir and Argja Bóltfelag. Thomsen made his international debut in 2010. In 2012, he signed a contract with Danish side South Carolina (U.S.) Egedal.
In 2013, he returned back home to the islands, and signed for B36 Tórshavn.