Your Feature Request / Idea
Coming from somebody who loves making different themed parks in sandbox, it can get a little dull working with the same island all the time. This was a similar issue with challenge mode. When challenge was first announced I imagined it would be a huge step up in the replayability of JW:E, but since it was always the same scenery it wasn't as great as expected. Similarly to the new maps in challenge mode, adding sandbox to the rest of the parks will make a big difference in the variety of sandbox parks.
However, this raises the question of how to include this into the game, because at the moment sandbox is only included in Isla Nublar's campaign. The best and easiest solution would most likely be unlocking a sandbox option (or possibly a new sandbox menu similar to challenge mode) once you five star Nublar in campaign.
Coming from somebody who loves making different themed parks in sandbox, it can get a little dull working with the same island all the time. This was a similar issue with challenge mode. When challenge was first announced I imagined it would be a huge step up in the replayability of JW:E, but since it was always the same scenery it wasn't as great as expected. Similarly to the new maps in challenge mode, adding sandbox to the rest of the parks will make a big difference in the variety of sandbox parks.
However, this raises the question of how to include this into the game, because at the moment sandbox is only included in Isla Nublar's campaign. The best and easiest solution would most likely be unlocking a sandbox option (or possibly a new sandbox menu similar to challenge mode) once you five star Nublar in campaign.