Preah Khan Vathanaka played for the senior team of
Preah Khan Reach during the 2011–12 season.
Boeung Ket Angkor Vathanaka signed a contract with
Boeung Ket in 2012. On 1 August 2015, Vathanaka scored all six goals in a 6–0 win over
Asia Europe United. Impressively, this was not even his best accomplishment; in a 12–2 over
Kirivong Sok Sen Chey on 11 July 2015 Vathanaka scored eight goals, the highest tally for a Cambodian-born player in the league, as well as giving him 16 goals in the first 8 games of the 2015 season. In the semifinals of the
2015 Mekong Club Championship Vathanaka scored all three goals in a 3–2 win over
Becamex Bình Dương, putting
Boeung Ket Angkor in the final. Although Boeung Ket Angkor lost in the final to
Buriram United, Vathanaka finished the tournament as the highest goalscorer, with five goals, and was also named best player. Vathanaka finished the 2015 league season with 35 goals, a total of 55 goals in all competitions including national and club, the most of any Southeast Asian player. In his first start of the 2016 season Vathanaka scored a hat-trick in under five minutes as
Boeung Ket Angkor beat
CMAC FC 6–0. In a match against
Svay Rieng on 21 May 2016 Vathanaka scored goals in the 85th, 89th, and 90+3rd minute as his team came from behind to win 3–1. The first goal, an audacious left-foot volley from a cross, was touted of one of the goals of the
2016 season. Vathanaka finished the
2016 Cambodian League as the top scorer for the second consecutive year with 22 goals, as his team Boeung Ket Angkor dramatically won the title on the last match day by a single point.
Fujiyeda MYFC During the 2016 season, Vathanaka was loaned out to
J3 League side
Fujieda MYFC. Donning his iconic number 11 shirt, Vathanaka didn't start a single game during his loan spell there, making only a single last minute substitution.
Pahang FA In December 2017 Vathanaka signed for
Pahang FA for the upcoming
season after a disappointing spell in Japan. He has since been released from
Pahang FA to be replaced by Issey Nakajima in an article by
FOX Sports Asia.
PKNS FC After Vathanaka was released from
Pahang FA, Vathanaka came back to Cambodia to rejoin his former club
Boeung Ket Angkor. On 18 January 2019,
PKNS FC signed Vathanaka on a free contract according to an Article . He was given the number 29 jersey instead of number 11 in which his famous
CV11 became
CV29. This was by far his most successful season playing oversea where he made over 13 appearances in the
Liga Super. He only made 10 appearances at
Pahang FA in that same league. ==International career==