Cabbage is pretty high in fiber content so yes cabbage can make you poop a lot if you eat a lot of the cabbage.
Some people have problems digesting cabbage as well so the cabbage may make them poop more or have bloating issues or even diarrhea.
But if you eat a lot of cabbage you could also get diarrhea even when you don't have digestive issues as the cabbage contains lots of fiber.
Cabbage is very healthy for you though so eating cabbage in moderation is okay but if you're getting diarrhea from eating cabbage then you're eating too much cabbage.
But it's normal to poop a lot when eating cabbage because of the fiber content.