Motoyama was born in Kitakyushu on June 20, 1979. After graduating from Higashi Fukuoka High School, he joined J1 League club Kashima Antlers in 1998. He debuted in July 1998 and he played many matches from 1999 season. In 2000, Antlers won the champions all three major title in Japan; J1 League, J.League Cup and Emperor's Cup first time in J1 League history. The club also won the champions 2001 J1 League for 2 years in a row. In 2002, he was given the number "10" shirt as Bismarck successor. Antlers also won the champions in 2002 J.League Cup.