The 46-year-old moves up from his previous role as Assistant Coach after first joining the GB programme as Head Coach of the men’s under-16s in 2019.
Clancy has worked with England Under 16s/17s and U19s, as well as coaching The Midlands in the Conference programme.
As well as facing the hosts Korea, GB will come up against Slovenia and a qualifier from the previous round.
These proposals will be brought up for vote by the IIHF Member National Associations (MNAs) at the 2020 IIHF Extra-Ordinary Congress, which is intended to take place in a virtual format with the target date on Wednesday, 24 June.
GB were set to compete against hosts Spain, as well as Chinese Taipei, DPR Korea, Latvia and Mexico, in the six-team tournament.
GB Under-18s Men were set to take part in the Division II Group A competition in Tallinn, Estonia from 22nd to 28th March.
GB Women were due to play in the Division II Group A tournament in Jaca, Spain from 29th March to 4th April.
The main team sponsorship includes GB Men, GB Women, GB U20s, GB U18s and GB U18s Women.
The venue for the six-team IIHF tournament is the Pabellon de Hielo and GB will face hosts Spain Women, as well as Mexico Women and DPR Korea Women.
He joins head coach Cheryl Smith and fellow assistant coach James Ashton in the GB Women’s programme.