I am not aware of a sugar free pound cake - but you can do well by using splenda rather than sugar and make your own. The
web site for splenda has recipes.
Cakes
Successfully make a cake sweetened with SPLENDAŽ Granular by following these tips:
For every 1 cup of SPLENDAŽ Granular, add 1/2 cup nonfat dry milk powder (sifted) and 1/2 teaspoon of baking soda.
Add sifted nonfat dry milk and baking soda to the remaining dry ingredients.
Otherwise follow the recipe's directions.
Baking: Check for doneness 7 to 10 minutes earlier than the recipe calls for.