The clip features Hemsworth in full costume as an overweight Thor as he sang the lyrics to "Hurt" while playing a guitar. The fat Thor look includes long hair and a full beard.
Hemsworth appeared as an overweight, depressed and usually drunk Thor in Endgame following the fallout from Thanos' destructive finger snap.
The actor said the video was shot between takes on Endgame as he waited in his trailer. Hemsworth joked that it helped him get into character.
Hemsworth appeared on The Tonight Show Wednesday to promote his new film, Men in Black: International, which hits theaters Friday. Tessa Thompson, Liam Neeson, Emma Thompson, Rebecca Ferguson and Kumail Nanjiani also star.