well modern Sanda has lost a lot of tradition behind it, but its origin are completely from traditional chinese martial arts.
you said that they also offered kungfu classes, maybe you should attend one and see how it goes. Ask the instructor there about the integration between the "traditional" class and the sanda class.
And as for sparring in kungfu...it exists and is also sometimes referred to as san-da or san-shou! so there is a link between traditional and modern, however finding a school that teaches both is often very hard to find.
"you're going to work till you wish you were dead and then keep going.."