[1] For the 2021 season, Sosidan began playing for the senior team of National Defense Ministry FC of the Cambodian C-League.
[2] That year he scored his first goal for the club on 14 July 2021 in a league match against Prey Veng FC after coming on as a 77th-minute substitute.
[3] That season he was called one of Cambodia's rising stars by Jose Rodriguez T. Senase of the Khmer Times.
[1] He went on to make his senior international debut on 12 October 2021 in the second-leg match against Guam, coming on as a second-half substitute for Lim Pisoth.
[5] Sosidan scored his first senior international goal on 10 September 2024 in a 2027 AFC Asian Cup qualification match against Sri Lanka at the Olympic Stadium.