Active Directory Accounts need to see only one database role.

I have more than 3000 Active Directory Users, I have created Role Level Security on one table by using Suser_name(), Now all the active directory users need to connect sql server and access the database role object. How can I achieve that without Using .net?I am able to add all active directory users to sql server in one go, but I am also trying to achieve same time to map with database role as well?Is it possible ?