Sport Hawke's Bay chairman Damon Harvey said Mr Clarke brings a wide range of skills and stakeholder connections to the board.
"We are thrilled to have someone of Aayden's calibre joining us as we look to launch our new strategic plan in the next couple of months," Mr Harvey said.
Mr Clarke said he was honoured to be asked by Ngāti Kahungunu to represent the iwi on Sport Hawke's Bay, and added: "We have many challenges in getting people active and healthy and I'm looking at making a valuable contribution."
Ngāti Kahungunu chief executive officer Dr Adele Whyte said the iwi is keen to maintain and develop its "strong" relationship with Sport Hawke's Bay and sees Mr Clarke as the ideal person to lead that connection.