Popczyński had a notable run as a player-coach in Faroe Islands, where he besides VB Vagúr also managed GÍ Gøta, HB Tórshavn and TB Tvøroyri.
[5] He coached the club for five years, before being sacked in favour of Jesper Tollefsen in July 2013 after missing promotion play-offs.
[6] In November 2014, Popczyński signed a one-year contract to replace Jesper Borup as the head coach of FC Djursland who were at the bottom of the Danish fourth division.
[7] However, he was unable to keep the team up and the club was relegated to the Jutland Series, the fifth tier of Danish football at the end of the season.
[11] A month later, on 12 December 2018, Popczyński was announced as the new head coach of Danish third tier club Kjellerup IF, who were bottom of the table.