He spent twelve years at the club, which included a short loan spell at Haugesund, before moving to the latter in 2006.

In 2010, he become the assistant manager of Haugesund, whilst occasionally featuring in friendlies for the club and matches with the reserves team.

[3] He returned to Haugesund as head coach in October 2016 and led the team to several strong league finishes.

After the sacking of Kåre Ingebrigtsen in July 2021, Horneland was appointed caretaker manager and later promoted to the role of head coach on 10 August.

[9][10] In 2023, Horneland led Brann to their seventh Norwegian Football Cup title and a UEFA Conference League play-off round, where they lost to AZ Alkmaar on penalties.