Hailing from Skjervøy, his career began in Skjervøy IK, where he played from 1985 to 1996 except for the season 1991 when he played in Strømmen IF and the seasons 1994-95 in Nordreisa. He then played in the Norwegian Premier League with Bodø/Glimt and Lyn, and in the First Division (second tier) with Lyn, FK Lofoten (on loan) and Skeid. His last club was Ull/Kisa, which he left midway through the 2007 season.
In November 2007 Stangnes was announced as the new coach of fourth-tier club Hammerfest FK. He left in March 2009. He took over Bossekop UL in 2012 and secured promotion from the 2012 3. Divisjon. He resigned in the summer of 2013. Ahead of the 2014 season he was hired as head coach of IF Fløya's women's team, but he was fired in early April.
- "Stangnes ny HFK-trener". Sjeik.no. 18 November 2007. Retrieved 25 April 2009.
- Isaksen, Oddgeir; Lunga, Trond Ivar (31 March 2009). "Stangnes ferdig i HFK". Finnmark Dagblad (in Norwegian). Retrieved 25 April 2009.
- Teigen, Arne (16 June 2013). "Ferdig i Bossekop". Framtid i Nord (in Norwegian). Retrieved 28 July 2013.
- Sivertsen, Øyvind; Eidissen, Lars (9 April 2014). "Ferdig i Fløya etter La Manga-episode". iTromsø (in Norwegian). Retrieved 10 April 2014.
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