I think you need to clarify your question.
I believe that you are saying that you would to add a row or rows into a SQL Server table or tables whenever a new user is added into the Active Directory. The row or rows will contain information from the AD entry for that user.
I'm not 100% sure if there is a mechanism in AD that allows a custom action based on an update similar to a trigger in a RDBMS. My feeling is that there isn't.
However, unless you need a real time update, that is probably not a problem.
There are other ways of getting to this information in the AD. My first suggestion would be to leave the data in the AD and use the ADSI OLEDB Provider and connect to the AD directly inside of your application.
You can use the same provider and update the SQL Server database at prescribed intervals from AD. I haven't tried it but you might be able to do this inside of DTS.
Hopefully I have given you enough of a hint to know where to start, but if you need more assistance, let us know.