Travellers paid a fleeting visit to Adur Reaction Ground in Shoreham this week.
Residents spotted the caravans at the back of the park on Sunday morning.
Adur and Worthing Councils was made aware on Monday that a large group of caravans and other vehicles had parked around the outskirts.
Sussex Police served a Section 61 notice on the travellers yesterday evening and they were gone by this morning.
A spokeswoman for the council said the grounds have been secured and that a clean-up is underway.