Fuji, adding to CurlyFro's previous post...

When you rmodule is rendered on the page your module gets "injected" into a container and in effect becomes another object inside the container object.  Me. visible hides your module object but since the container object is also on the page it still is visible.  Me.ContainerControl.visible sets the visibility of the container object that your module resides in. 

The following should accomplish what you want.  In the Page_Load sub of your module put...

            If Not MyBase.UserInfo.IsInRole("Administrators") Then
                Me.Visible = False
                Me.ContainerControl.Visible = False
            End If

As you probably already know all modules inherit from the base class PortalModuleBase.  The base class includes the UserInfo object for the current user which knows about the roles the current user is a member of.  By using the IsInRoles method which is included in the UserInfo object you can find out if the user is in the "Administrators" role and set the visibility accordingly.

(FYI, I just tested this before writing this post)

Good luck,

Chuck R.