Land that you already own in Denentraland, or an alternate reality Decentraland where you own everything and want to sell it to others? The answer to both of those is yes.
All land sales happen on chain, so you can do it all directly from Etherscan if you want, no need to spin up a server.
Also, yeah, it's all open source. You deploy your own world contract, and point your version of the Decentraland engine at your contract, and you're good to go. You now control all the land and can sell it off as you see fit. You can even have a small property in the primary Decentraland which teleports you to AnimatsLand, and you could let people wear their same NFT outfits and everything.
All land sales happen on chain, so you can do it all directly from Etherscan if you want, no need to spin up a server.
Also, yeah, it's all open source. You deploy your own world contract, and point your version of the Decentraland engine at your contract, and you're good to go. You now control all the land and can sell it off as you see fit. You can even have a small property in the primary Decentraland which teleports you to AnimatsLand, and you could let people wear their same NFT outfits and everything.