[2] In August 2019, Sointu signed a short-term deal with UK EIHL side Cardiff Devils as injury cover for Joey Martin.

He later spent time with Austrian side Dornbirner EC, before returning to Finland to join Kiekko-Vantaa.

[5] On February 25, 2021, Sointu joined HC La Chaux-de-Fonds of the Swiss League as a replacement for injured Tim Coffman for the remainder of the season.

In October 2021, Sointu returned to the UK EIHL to sign for the Sheffield Steelers, joining as the roster replacement for Travis Oleksuk.

[6] In August 2022, Sointu joined fellow Sheffield players Vojtěch Polák and Rok Stojanovic in moving to Polish club Cracovia Krakow.