[citation needed] Sosin came to Cyprus in 2002 and joined Apollon Limassol from Odra Wodzisław Śląski.
Sosin was the top goalscorer of the Cypriot First Division three consecutive seasons (2003–04 to 2005–06) while playing for Apollon Limassol.
Sosin earned four caps with the Poland national team, scoring two goals in his debut in a friendly against Saudi Arabia in March 2006.
His last game was against San Marino in April 2009, where he struck the post, and provided an assist on Marek Saganowski's goal.
In September 2017, Sosin joined Pafos's academy in Cyprus as their technical director,[2] a role he held until the end of 2019.