Minecraft wiki entry for Server_maintenance, associated text: If you want to reset a player's inventory, position, or any other related data about them, you can remove the player's .dat file. Navigate to the Minecraft server directory, open the world folder, open the player's folder, and delete the .dat file which has the UUID that corresponds to the player's current username. This folder is at "minecraft\world\players", where "minecraft" is the folder where Minecraft was installed on the server. This will cause the player to start over at the spawn point with no inventory and no items in their ender chest. The player's changes to the world will be untouched, along with any inventory stored in chests. This will not ban the player that has been deleted.