Willem II is playing their home matches at the 'Koning Willem II stadion' ("King Willem II stadium") located at the corner of the Goirleseweg and Ringbaan-Zuid in the south of Tilburg.  It was first opened in 1995 and is currently being refurbished to better accommodate the players and staff, e.g. with a new gym.

Also located at the stadium are a pub and the official Willem II merchandise shop.  There is plenty of free parking spaces in front of the main entrance, except on matchdays when you'd need a permit to park directly next to the stadium.      Around home matches there is usually space to park your car for free in the surrounding areas of the stadium at about a 10, maybe 15 min walk.

Alternatively you can go to Tilburg by train and take bus #132 to Baarle-Nassau/Breda or bus #450 to Turnhout (Belgium).   Both these busses have a stop right in front of the stadium.              

Another possibility is to take bus #8 to Het Laar from Tilburg railway station.  Closest bus stop for this lane is called 'Oude Goirleseweg/Laarstraat' and is located across the Ringbaan-Zuid at approx 400 meters from the stadium.