[6] In 1977 he was also team manager of Norway U-18 with players such as Ola By Rise, Knut Torbjørn Eggen and Øivind Husby.
In the 1980 3. divisjon they experienced a particularly good start,[11] and eventually managed to secure promotion to the second tier, following a 2–0 victory against rivals Stabæk.
[14] When the merger fell through, he nonetheless became youth coordinator of Frigg while Egil Olsen was the head coach.
[16] In addition, he finally left Norway U-18 after five years in charge, leaving Anders Fægri to take over the reins.
The board of directors had vowed to acquire a coach from another part of Norway, but Sigmundstad was reportedly the fourth or fifth candidate on the shortlist.
The local newspaper lambasted him for inadequate physical exercise, "endless theory and tactics chat" and lacking "particular strength in getting the players "sufficiently ignited".
[26] This move did not materialize, and Sigmundstad stayed in Trøndelag, coaching both the men's and women's team of lowly Opphaug IL.
He moved back to Oslo in the summer of 1988, vowing to commute to Ørland Municipality during the weekends to finish the 1988 season at Opphaug.
[32] Wanted by Tromsdalen UIL as their head coach, Sigmundstad was not able to leave Eastern Norway at the time and rejected the job offer.
Sandefjord was in a lower tier at the time, and as such was possible to combine with Sigmundstad's work as a coordinator and lecturer at the Norwegian School of Sport Sciences.
[35][36][37] In January and February 1996, the media reported extensively on negotiations between Sigmundstad and IK Start to take over the vacant manager position there.
[43][44][45] Despite a decent 1997 season, Sigmundstad made the announcement in September 1997 that he would not continue in Ørn, opting to return to his former club Bærum.
[48] Sigmundstad spent 2001 as head coach of Mercantile, eliminating Bærum from the 2001 Norwegian Football Cup, but failing to win promotion from the 2001 3.
[53] In 2006 he reportedly made the shortlist for new Aalesunds FK manager,[54] but was not hired, and instead joined minnows IL Heming.