Here is a guide on how to delete a module?
If necessary, you an delete a module in your course. Deleting a module also deletes all associated module items.
When you delete a module, all of the items in that module are removed, but they are not deleted from the course.
Open Modules
In Course Navigation, click the Modules link.
Delete Module
Click the Options icon [1]. Select the Delete link [2].
Confirm Deletion
Click the OK button.