Drizzle olive oil on a parchment or foil-lined baking sheet. Scatter the sweet potatoes on the baking sheet. Sprinkle with salt and pepper. Bake for 20-30 minutes, stirring the potatoes halfway through baking.
Place the kale in a large mixing bowl and add the salt and lime juice. Massage the kale with your hands for 5-6 minutes, until the leaves are tender. Add the tomato, jicama, onion, jackfruit, black beans, roasted sweet potato, and corn.
Mix all of the dressing ingredients together and pour over the salad, mixing to coat the kale and vegetables. Salt and pepper to taste. Serve chilled.