Kerschbaumer came to prominence in his homeland with SKN St. Pölten, from whom he transferred to top-flight club Admira Wacker Mödling in 2015.

[5] Kerschbaumer joined Erste Liga club First Vienna on loan for the duration of the 2011–12 season,[6] making 33 appearances and scoring five goals.

[8] Kerschbaumer played in every match of St. Pölten's run to the Austrian Cup final,[5] which ended in a 4–2 defeat to Red Bull Salzburg.

[10] He made 16 appearances and scored one goal during the second half of the 2014–15 season, helping the club to finish above the relegation place.

[16] Kerschbaumer made two early 2016–17 season appearances before falling out of favour with head coach Dean Smith and dropping out of the squad in mid-September 2016.

[17][18] On 5 February 2017, while making just his seventh appearance of the season, Kerschbaumer finally scored his first goal for the club in a 3–3 draw with Brighton & Hove Albion.

[21] He made 32 appearances and scored eight goals during the 2017–18 season,[22] in which the Blues narrowly missed out on the promotion playoff place.

[23] Kerschbaumer departed Brentford on 1 June 2018 and made 52 appearances and scored one goal during two seasons as a first team player at Griffin Park.

Bundesliga club FC Ingolstadt 04 on a three-year contract for an undisclosed fee (reported to be £900,000),[26] effective 1 July 2018.

[5][31] After his return, he made just five appearances and late in the season,[5] it was announced that Kerschbaumer would be released when his contract expired in June 2022.

[5] On 23 May 2022, Kerschbaumer signed a three-year contract with Austrian Bundesliga club Wolfsberger AC on a free transfer, effective 1 July 2022.