Add a module to an existing game

Is it possible to add a module? I just picked up LMoP and I want to add it to a game, as we already rolled our characters.

No, your best bet with a Plus subscription is to use character vault to copy characters into a new game created from the module.  If you had a pro subscription, you could use the Transmogrifier to copy maps and content over to the existing game.

With the release of Tales from the Yawning Portal to be released soon this seems like a very around about way to get things into game. My main interest in the module set is for use in my current campaign. When i need a dungeon it would be possible to quickly add one OR be used to help with any random PC wanderings around the world map.

I wonder if they will implement this somehow.

Tony: With Tales from the Yawning Portal, you'll be able to add them to existing Games:  (from the Blog Post)

The seven adventures will be available as Addons, so you can pick & choose from the individual adventures to add to your pre-existing games.

With a Pro subscription, you can use Transmogrifier to move over most anything from a module Game to an existing Game if you find you need to.