After spending three seasons at Yokohama Flügels, he returned to his native Shizuoka by signing for Shimizu S-Pulse. Kuboyama holds the distinction of having scored the 7500th goal in the J1 League, which he accomplished in November 2001 against JEF United Ichihara. In December 2007, he announced his retirement from professional football.
He is currently a coach of Shimizu's junior youth team. (as of January 2008)