Low carb soups are a great addition for those on a low carb diet. You should also pay attention to the amount of sodium and sugar, especially in a canned soup. You should obviously avoid starchy fillers. Starchy ingredients should be avoided also so the classic chicken noodle soup is not recommended (as opposed to low carb chicken soup).
There are low carb soup mixes available. Others come a canned. The lists of these soups are available so take a look and decide which one suits you best. Take a look at low carb chicken soup, onion soup or a beef soup.
One popular question is if you can lose weight by just eating soup. Since soup is regarded a low calorie, in theory you can lose weight. However, there are not concrete scientific evidence yet, and you should supplement a soup only diet to make sure you have nutritional balance.
