He previously played domestically for Kawasaki Frontale, from where he spent time on loan with the J.League U-22 Selection, Hokkaido Consadole Sapporo and Yokohama F. Marinos.

On 20 August 2019, he joined Belgian First Division A side Royal Antwerp on loan for a year from Kawasaki Frontale with an option to make the deal permanent.

[3][4] Miyoshi joined English Championship club Birmingham City in June 2023 after his contract with Royal Antwerp expired.

[7] In a chaotic season for Birmingham with multiple managerial changes, at the end of which the team were relegated to the third tier, Miyoshi appeared in all but three matches, scoring six goals and making six assists in league competition.

On 24 May 2019, Miyoshi was called up by Japan's head coach Hajime Moriyasu to feature in the Copa América played in Brazil.