The ornamental design of a cover for a shoeinsole, as shown and described.
FIG. 1 illustrates an isometric view of a cover for a shoe insole in use.
FIG. 2 illustrates a top plan view thereof; and,
FIG. 3 illustrates a bottom plan view thereof showing an envelope opening.
All of the surfaces of the cover for a shoe insole upon which the broken lines are shown form part of the claimed design. The broken lines form no part of the claimed design.