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

Here is Why You Need An Adapter

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

Sint Maarten

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

Type A

Type B

New Caledonia

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

Type C

Type F