If You mean have it available at another alternative url then If your coding, then use menu_execute_active_handler (Available in Drupal 6 and 7) Else you can Use Url aliases by enabling the path module (Path Module is part of D7 core)
If you mean make a copy of it to use on another site then try this: https://drupal.org/project/webform_share (You can import/export webforms.)