Yokoyama was born in Kanagawa Prefecture, Japan. 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]
Yokoyama made his Singapore Premier League debut on 25 February 2023 against the Young Lions. He came on as a substitute in the 75th minute and helped his team win 3–0. [3]