What CGR said is good, but I'll expand on it a little...

Usually, the first thing we learn is "Boxing the field". So have him continue to fly the box, but power down on each down-wing leg, and make each pass of the runway a landing approach. Tell him, "You're not going to land, you're just going to shoot approaches"

Pick a spot on the left (assuming you're coming in from the left) like a tree, building, of telephone pole that he should be lined up with when he turns onto final. You may find that "If you turn just after you pass that tree in the distance that you will be lined up with the runway" Etc.

Each pass of the runway will get lower and lower, BUT, tell him not to ever think, "I'm going to land next time"

Just plan to make another approach, with a planned go-around.

But when the time comes that the approach is really good, instead of going around, just flair and let it settle in.