From Sonos' website:

"ENJOY SONOS IN MORE THAN ONE PLACESonos offers support for more than one household so you can easily enjoy Sonos wherever you have access to a Sonos system.
Select Add Another Sonos System from the Settings menu when you are prompted to connect to a household. Once you add the household, it will automatically connect as you move from one place to another.
To remove a household from your controller, select Forget Current Sonos System from Settings -> Advanced Settings."

Finally