Strømsgodset Wikheim made his debut for
Strømsgodset on 10 April 2011 against
Odd, in a match his club won 2–0. He scored his first goal in a 2–1 loss against Molde on 23 March 2012. He gradually played more and more for Strømsgodset, and got his major breakthrough in the 2014 season, when he featured in 27 of the 30 league matches for the club.
KAA Gent On 17 December 2015, Wikheim signed a contract lasting until June 2019 with Belgian club
KAA Gent, in a €1.6 million deal.
Loan to FC Midtjylland In the dying hours of the summer 2016 transfer deadline, Wikheim was presented in FC Midtjylland on a one-year loan with a buy-out option included from KAA Gent.
FC Midtjylland On 21 June 2017, the club decided to sign him permanently on a four-year contract.
Al-Fateh On 1 September 2019, Wikheim was announced at Al-Fateh on a three year contract.
Djurgårdens IF On 26 January 2022, Wikheim was announced at Djurgårdens IF on a three year contract.
FC Nordsjælland On February 13, 2025, it was confirmed that Wikheim was returning to Denmark as he had signed a deal until the end of 2026 with
Danish Superliga club
FC Nordsjælland. ==International==