In SQL Server Management Studio, go to Object Explorer > (your server) > Security > Logins
and right-click New Login
:
Then in the dialog box that pops up, pick the types of objects you want to see (Groups
is disabled by default – check it!) and pick the location where you want to look for your objects (e.g. use Entire Directory
) and then find your AD group.
You now have a regular SQL Server Login – just like when you create one for a single AD user. Give that new login the permissions on the databases it needs, and off you go!
Any member of that AD group can now login to SQL Server and use your database.