Ingi Þór served as an assistant coach at KR from 1998 to 1999 and 2008–2009, helping the club win the national championship in 2009.[4][5]
On 12 June 2018 he was introduced as the next head coach of the reigning men's national champions, KR, replacing Finnur Freyr Stefánsson.[6][7] On 4 May 2019, he won his third Úrvalsdeild karla championship when KR beat ÍR 3–2 in the finals.[8] He led KR to a 14–7 record during the 2019–20 season before the last game and the playoffs were canceled due to the coronavirus pandemic in Iceland. In May 2020, he was fired from his post.[9] Less than two weeks later, he was hired as an assistant coach to Stjarnan.[10]