After graduating from Osaka University of Commerce, he joined J1 League club JEF United Ichihara in 1998.

In 2000, he moved to Japan Football League (JFL) club Yokohama FC.

In September 2004, he moved to J2 club Ventforet Kofu and played as regular player.

After retirement, Yokoyama started coaching career at TDK (later Blaublitz Akita) in 2008.

This biographical article related to a Japanese association football midfielder born in the 1970s is a stub.