[2] As a kid, Shimomura played for the youth academy of J1 League club Tokyo Verdy.
[2] Later, he went on to study and play for Funabashi Municipal High School[3][4] where he won the national championship.
[5] After graduating high school, Shimomura played college football for the varsity team of Toin University of Yokohama in 2016.
He signed his first professional contract with Veertien Mie, before leaving after 1 year to join Hokkaido Tokachi Sky Earth.
[12][13][14] In 2024, the announcement was made that Shimomura would leave Tokyo 23 to play abroad, signing with new club One Taguig of the Philippines Football League as an international reinforcement.