Hi Kalyan,
With out of the box implementation you can only allow a user till a certain path and could force him to log in if he tries to access any url configured or its child.
In the SAML authentication handler configuration, present in configuration manager, you would find a property called path. You might choose to enter a certain path for which the user has to authenticate through same. Same applies for its child pages also. By default it entered as /.
Hope this helps you,
Thanks
Tuhin