You can use tomato sauce instead of tomato soup in some recipes, but it may alter the taste and consistency of the dish. Tomato soup typically has a smoother and creamier texture than tomato sauce, so you may need to adjust the amount of liquid and seasonings to achieve a similar result. Additionally, some tomato sauces have added ingredients such as herbs, garlic, or onions, which can affect the overall flavor of the dish. Therefore, it is recommended to consider the recipe and taste it before serving if you are using tomato sauce as a substitute for tomato soup.