On 1 March 2013, Ojamaa signed a three-year contract with Nõmme Kalju.

[1] He mainly played for the club's reserve side, Nõmme Kalju II, making only a single Meistriliiga appearance for the first team.

[3] On 20 July 2017, Ojamaa joined Finnish Veikkausliiga club JJK for the remainder of the 2017 season.

[6] On 3 January 2021, Ojamaa returned to Estonia signing for Paide Linnameeskond.

Ojamaa made his senior international debut for Estonia on 6 January 2016, in a 1–1 draw against Sweden in a friendly.