It is possible, but involves some wheel building skills.
If the new rim has the same diameter at the spoke holes (aka ERD) then it uses the same length spokes. So you can slacken all the spokes in the old wheel, tape the wo rims together and transfer spokes one at a time to the new rim. Otherwise you have to lace from scratch, most likely with new spokes. Then the spokes have to be tightened, the rim brought to center and aligned, and the wheel trued up just like a new build. So the only steps you get to skip is the initial lacing that a new wheel from scratch would need.
As you can see it's not a super simple operation, so it beg the question ---- WHY?
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