The announcement was made this week after the arrival of the 2015 NRL Premiership Trophy into the country led by veteran Cowboys player, Brent Tate.
Trukai has been sponsoring the Cowboys since 2008.
Its logo will continue to appear prominently on the Cowboys uniform shorts.
General Manager for Sales & Marketing, Andrew Daubney said it was a great pleasure to be part of the Cowboys in their partnership to continue to promote and develop rugby league in PNG.
Cowboys General Manager for Commercial, Steve Mitchell said the Cowboys want to be part of the growth of rugby league in PNG.
“We love coming here to PNG. The support we have here is extraordinary. We love the passion that people have for rugby in this country.
“We have plans to build a Cowboys support base here in PNG with PNG based membership plans.
“We want to develop the game here with good social outcomes,” said Mitchell.