Johansson made his professional debut with Leksands IF in the HockeyAllsvenskan, after developing through their junior ranks, in the 2017–18 season.

On 23 June 2018, Johansson was selected by the Minnesota Wild in the first round, 24th overall, of the 2018 NHL Entry Draft.

[1] On 25 March 2020, Johansson left Leksands IF after five seasons within the organization by agreeing to a two-year contract with Frölunda HC.

[4] At the conclusion of his contract with the Canucks, as a pending restricted free agent, Johansson opted to return to his native Sweden in signing a two-year contract to continue in the SHL with Rögle BK on 16 May 2024.

[5] This biographical article relating to a Swedish ice hockey defenceman is a stub.