The nearest station is Lamotte-Beuvron.
From the Lamotte-Beuvron station to the village, you can take the shuttle service (for admission): on Monday and Friday, at train's arrival 3:25 pm, 5:27 pm*.
For others schedules, you can call a taxi.
From Paris: take the train at the Austerlitz station, direction Chateauroux.
* Subject to change.
The closest airports to the park are Bourges Airport (FR, 91 km) and Tours Airport (FR, 121 km).