Place the cooked pasta, tomatoes, cucumber, parsley, sprouts, and onion into a large bowl.
Make the cashew butter dressing by adding all of the ingredients to a jar or container and shaking to mix well.
Pour the dressing over the pasta salad and mix well to coat. This is best served the day of making and doesn’t store very well. If you want to make it to have the next day, keep the dressing separate from the pasta salad until serving.