AC長野パルセイロ
Sada was born in Maebashi on March 18, 1984. After graduating from high school, Sada joined J1 League club Sanfrecce Hiroshima in 2002. Sanfrecce was relegated to J2 League from 2003 season. In 2004, he moved to Japan Football League (JFL) club Thespa Kusatsu, where he played as a defensive right back. Thespa was promoted to J2 from 2005. Shortly afterwards, Sada became a more frequent player. His opportunity to play decreased from summer 2010. In 2012, Sada moved to JFL club AC Nagano Parceiro. He retired at the end of the 2012 season.