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Short Answer

No, you cannot change your island map. The island map is fixed for all players in Pokemon Pokopia. Every player starts at the Withered Wasteland, and the terrain for all areas remains the same across every save file.

How Island Maps Work

Unlike games such as Animal Crossing: New Horizons where each player gets a randomized island layout, Pokemon Pokopia uses a fixed map. Every player experiences the same geography, terrain layout, and area placement. This means visiting another player's world in multiplayer will show the same base terrain structure as your own.

Fixed Areas

All five main areas have identical terrain for every player:

Cloud Islands: The Alternative

While the main island cannot be modified, Cloud Islands offer customization through rerolling. Cloud Islands can be rerolled every time you recreate them, giving you a different layout each time. However, newly created Cloud Islands start without any pre-installed facilities, so you need to build everything from scratch.

Cloud Island Optimization

When creating a Cloud Island, it is best to create one with a PC located near the center of the map, then build your house and Pokemon Habitats nearby. This central placement makes navigation across the island much easier and reduces travel time when managing your town.

Summary

The main island map is permanent and identical for all players. If you want layout variety, Cloud Islands are the only option. They can be rerolled freely, though you trade convenience (no pre-built facilities) for layout flexibility.