Pius' began appearing in student films and short films in 2010. In 2014, he was cast, along with his brother Märt, as the Käär brothers in the Elmo Nüganen-directed war drama "1944" which was selected as the 2015 Estonian entry for the Best Foreign Language Film at the 88th Academy Awards but it was not nominated. In 2015, Pius had a starring role as Eero in the Urmas Eero Liiv-directed thriller "Must alpinist" for Kopli Kinokompanii. The film is loosely based on the events of the Dyatlov Pass incident of 2 February 1959, where nine ski hikers mysteriously died in the northern Ural Mountains after establishing a camp on the slopes of Kholat Syakhl. However, the film differs in many key ways from the original incident. In 2017, he appeared in two films; the Priit Pääsuke-directed drama "Keti lõpp" and the Andres Puustusmaa-directed comedy "Rohelised kassid". In 2018, he appeared in the Anu Aun directed family-Christmas film "Eia jõulud Tondikakul".