This lasts through to the end of 2023, giving Jacks of PNG the right to manufacture, advertise and distribute the national team's apparel.
All Jacks of PNG stores will run the clothing for the public to buy.
Jacks is also to sponsor PNGOC to the value of K100,000, which would cover the uniforms for the recently completed Birmingham 2022 Commonwealth Games and the 2023 Pacific Games in the Solomon Islands.
"Jacks PNG came on board last year sponsoring Team PNG's walk-out uniform for the Tokyo 2020 Olympics, and we are pleased to see this partnership extend to include Team PNG merchandise," said PNGOC secretary general Auvita Rapilla.
"They have identified with our Team PNG brand and values. This partnership will allow the public to share in the pride of the nation by donning the colours of team PNG branded apparel in support of the multi-sporting events that we travel to and attend each year.
"Now you too can support Team PNG by visiting your nearest Jacks of PNG shop and purchasing your own official Team PNG supporter merchandise."
Papua New Guinea is set to take a large team to the Pacific Games, aiming to make the top three in the medals table for the fourth Games in a row.
The nation finished first at the 2015 Pacific Games on home soil in Port Moresby.