In 2015, Sander took his own one man horror drama "Behind the Random Denominator" (which he wrote, directed and starred in) to the solo theatre festival "United Solo" in New York, earning him the Best Sound Design award. The film version of the play became Sander's directorial debut feature. The film premiered at the Haapsalu horror and fantasy film festival HÕFF. It later won Sander his first Best Director award at the 9th Nice International Film Festival and Best Lead Actor award at the Madrid International Film Festival, where he won against such stars as Laurence Fishburne and Bruno Ganz. In 2018, his short "Actually" premiered at the HÕFF. This film won the Award of Excellence at the Global Shorts Film Festival in Los Angeles, USA in September 2018 and was awarded The Best Horror Short at the Venice RAGFF Film Festival in December 2018. In January 2019, the film received two awards from Cinema World Fest Awards and in June won the Short Film Factory festival in Romania. Also in 2018, he wrote and directed an ambitious 10-part historical TV series "The Whores", which is considered the most internationally successful Estonian TV production, as well as a TV movie "The Bughouse" (in Estonian, "Äratõmbetuli"), based on his own stage play.