Fallmann took over of the reserve team of
St. Pölten at the beginning of the 2013–14 season. His first match was a 3–2 win against ASK Bad Vöslau on 10 August 2013. He became the interim head coach of the first team on 21 March 2015. He became the third coach of the 2014–15 season after
Herbert Gager was sacked in October 2014 and
Michael Steiner was sacked on 21 March 2015. He was appointed as first team assistant manager under
Karl Daxbacher for the 2015/16 season. From 3 to 27 October, Fallmann took over the reserve team of the club as a caretaker manager. He was in charge for three games, and got only one point. On the same day, he was promoted to first team manager. In September 2017, he decided to resign. In March 2019, he was appointed as manager of
SKU Amstetten. ==Coaching record==