Poor defence gave the Scots their first points through Jamie Farndale who put on some good footwork out wide to run fifty metres to score.
Scotland continued to control possession and were in for their second try after Darcy Graham showed he had too much pace on the wing.
A try to George Horne extended Scotland’s lead to 17-0 going into the sheds.
The Pukpuks couldn’t control the ball and it only cost them more points with Scotland, running in two more tries in the second half with Farndale grabbing his second and one from a James Fleming intercept try.
PNG has two matches left and will take on the number one world ranked South Africa at 6:37pm and then later tonight, Malaysia at 9:55pm.