He began his youth career with SFAT ISEHARA SC before moving to Tokai University Sagamihara High School.
After graduating from high school, he joined the Osaka University of Health & Sport Sciences.
[1] In January 2023, Yokoyama signed his first professional contract with Singapore Premier League club, Albirex Niigata (S).
He made his professional debut on 19 February 2023 in the 2023 Singapore Community Shield against Hougang United.
[2] Yokoyama made his Singapore Premier League debut on 25 February 2023 against the Young Lions.