You Do Need power plug adapter while traveling from New Caledonia to Sint Maarten.

Here is Why You Need An Adapter

The outlet and plug type used in Sint Maarten are A and B and in New Caledonia are C and F. This is how they look like.

New Caledonia

In New Caledonia, outlets of type C and F are in use.

Type C

Type F

Sint Maarten

In Sint Maarten, outlets of type A and B are in use.

Type A

Type B