He played in 2014–15 Euroleague Basketball Next Generation Tournament for BC Žalgiris youth.

Although his team didn't make to the final, he won the three-point shootout contest.

On 2 February 2024, he signed with Stal Ostrów Wielkopolski of the Polish Basketball League (PLK).

On 12 June 2024, Beliauskas signed a one-year deal with Juventus Utena of the Lithuanian Basketball League (LKL).

[6] He won bronze medals with the Lithuania national team in 2015 FIBA Europe Under-18 Championship.