Password Protected Page

Page-level permissions is not available in New Sites.

You can create a separate site and share it with your group and link to it from the main site.
You can make a navigation link to the private site.

See the 'Admin' link on this site:

Add a link to your site menu

  1. On your computer, open a site in new Google Sites.

  2. At the right, click Pages.

  3. Click the page with the menu you want to update.

  4. At the right, point to Add .

  5. Click New link .

  6. Add a link name.

  7. Add the web address of the private site.

  8. Click Done.