Robert Ibertsberger became assistant manager of Wolfsberger AC in 2017. He then was appointed manager of Wolfsberg on 26 March 2018 and was manager until the end of the 2017–18 season. His first match was a 2–0 loss to Red Bull Salzburg. Ibertsberger left Wolfsberg to become assistant manager of Austria Wien. On 11 March 2019, Ibertsberger again replaced an outgoing manager. He replaced Thomas Letsch at Austria Wien. His first match was a 1–0 loss to Sturm Graz. He became manager of SKN St. Pölten on 9 March 2020. St. Pölten finished the 2019–20 season with five wins in 10 league matches. St. Pölten's 2020–21 season started with a 3–1 win against ATSV Wolfsberg.