Use controller in third-party folder

Hello
My project have 2 section (User portal,Admin panel)
I want to place admin panel folder in third party folder
Example :
third_party/admin/controllers
third_party/admin/models
third_party/admin/libraries

In third_party/admin/controllers exist profile.php controller and i need to call this controller in browser
I cannot use add_package_path for use this advance
maybe?