He became Japanese national champion for the first time in 2021, scoring a tally of 1459 points.

[2] During the 2022 Pentathlon World Cup event in Budapest, Sato publicly protested the removal of the equestrian element in future modern pentathlon events by wearing a T-shirt at the fencing element of the competition with the slogan "Save Riding and Change The Rules”.

[3] He won silver at the World Cup Final in the mixed relay in 2022.

[4] He was a bronze medalist in the men’s team event at the 2022 Asian Games in Hangzhou.

[5][6] He came in second place in the 2023 Modern Pentathlon World Cup leg in Sofia, Bulgaria.