Scenario:
If you do not require the Web TimeSheet administrator/ any other employee to enter time on timesheet then you can disable timesheet entry for the specific user(s).

Log into Web TimeSheet as an Administrator and click on Administration tab at the top.
Click on Permissions in the left menu, under User/Departments.
Click the edit button beside Administrator/Other permission assigned to the user.
Expand TimeSheet in the System tab.
Uncheck Allow time to be entered and click Save at the bottom of the screen.

Note:
The above mentioned steps will restrict an Administrator/other permission to enter time on the TimeSheet only if Administrator permission is enabled. If more than one permission is enabled, then, if the other permission has the timesheet permission enabled, the user will have access to the timesheet.