I claim the ornamental design for a surface ornamentation for a pouch of a sanitary absorbent article, as shown and described.
The sole FIGURE is a top plan view of the surface ornamentation for a pouch of a sanitary absorbent article showing my new design.
The broken line (or dash-dot-dash line) showing of the boundary of the claimed design is included for the purpose of illustrating environmental structure and forms no part of the claimed design.