Career
Ojamaa started playing football with the youth academy of Levadia in Tallinn. He made his Meistriliiga debut on 10 September 2011, in a 6–0 victory over Ajax and scored his first Meistriliiga goal three days later, against the same team In 2013, Ojamaa signed for Nõmme Kalju.
He made only a single league appearance for Nõmme Kalju.
On 18 July 2014, he joined Tammeka for the remainder of the season. In 2015, Ojamaa returned to Levadia.
Ojamaa started his international youth career in 2010. He earned his first senior cap for Estonia on 6 January 2016, in a 1–1 friendly draw against Sweden.