I'm by no means a baker, but the two are different. However, you can substitute, but you may not get what you are looking for and have to modify the recipe in other ways.
Generally, you will need 3 teaspoons of baking powder to equal a teaspoon of baking soda. But the baking soda is a base, and the baking powder is more neutral, so you may have to reduce the amount of acid in the recipe.
The following article explains it well.
The Difference Between Baking Soda and Baking Powder SimplyRecipes com
Good luck,
Paul
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