Selected by the Red Wings in the sixth round (159th overall) of the 2019 NHL Entry Draft, Soderblom has developed in Frolunda's system since 2014-15 and made his SHL debut during the 2019-20 campaign after leading the under-20 circuit with 29 goals in 36 games. In total, Soderblom recorded 76 points (40-36-76) and 22 penalty minutes in 87 games at the under-20 level, 53 points (26-27-53) and 14 penalty minutes in 60 games at the under-18 level and 93 points (62-31-93) and 49 penalty minutes in 78 games on the under-16 circuit, all with Frolunda. The Gothenburg, Sweden, native racked up three points (2-1-3) in five appearances for his country at the 2021 IIHF World Junior Championship. Along with fellow 2019 Red Wings draftees Albert Johansson and Albin Grewe, Soderblom was also a member of Sweden's silver-medal Hlinka Gretzky Cup team (1-2-3 in five games) in 2018 and gold medal-winning IIHF World Under-18 Championship squad (1-0-1 in seven games) in 2019.