Simon is a was born on June 14, 1999 and currently plays for Ilves in the Finnish Elite League (Liiga). He grew up in Stockholm, Sweden playing hockey in the Djurgårdens IF system. In 2017-18, Simon made his debut in the Swedish Elite League (SHL) with Djurgårdens IF as an 18-year-old. Simon has represented his country multiple times suiting up for Sweden in both the U19 and U20 tournaments. In 2018, the Minnesota Wild selected Simon in the 5th round, 148th overall. On April 28, 2022, the Wild signed Johansson to a two-year, NHL entry-level contract.