All users in your domain can find and share sites, but as a Google Apps account administrator, you can adjust the sharing options to restrict access.

To change sharing options in sites:

1. Sign in to the Google Admin console. 


2. Do one of the following:
   • In the classic Admin console, click Settings > Sites > General.
   • In the new Admin console, click Google Apps > Sites > Access Settings.
     ^{Where is it?  Which Admin console do I have?}
    


3. In the Sharing options section of the page, select from the following options:
   
   
   • Users cannot share sites outside <domain name>
     Only domain users can view the sites you and your users create.
   
   
   • Users can share outside <domain name>, but will receive a warning each time
     Users in your domain can invite outside individuals to view sites they create, but are reminded that they're sharing outside the domain each time they do so.
   
   
   • Users can share sites outside <domain name> (without any warning)
     People in your organization can invite others to view sites they create on an individual basis.
   
   
   • Users can make Sites public
     Users can publish sites that anyone on the internet can find. Sites become accessible without logging in, and may be indexed by search engines.


4. Click Save changes.

Note that users can set access options for sites that they create, but they won't be able to share a site more widely than the option you select here.