The action has been brought by Salzagold Limited, which claims the illegal occupation has turned its property into "a base for anti-social behaviour."
It claims that more that 40 caravans, and some 150 people are currently trespassing on lands the company owns at Graigcullen which it wants to develop into much needed housing and other facilities for the nearby Carlow town area.
The occupiers, it claims, first entered the lands earlier this month, have refused to leave, and it is feared that an additional 30 caravans may soon go onto the site, the court heard.
The company says that it is hugely concerned by the behaviour of the people allegedly occupying the lands and who have no authority to be there.
The alleged behaviour includes the starting of larges fires, anti-social behaviour, and the dumping of large amounts of refuse and waste on the property.
In recent days the company said that the local fire brigade had to put out a large fire that had broken out on the site. It is believed that the a range of material including refuse and wood have been burnt.
The company, represented by Stephen Byrne BL, seeks various orders including an injunction requiring persons unknown and all those who have knowledge of the orders to vacate and cease interfering with the lands.
The action is also against one named individual who it is claimed is acting as a spokesperson for the group, a Hugh Doyle otherwise Hughie Doyle.
The court heard the land in question was the subject of a previous illegal occupation in March of this year. However, the small number of people who were on the lands on that occasion departed the site shortly afterwards, it claims.
The matter came before Mr Justice Brian O'Moore who granted the applicant, on an ex-parte basis (one side only represented), permission to serve short notice of the injunction proceedings on the persons allegedly illegally occupying the lands.
The action will return before the court next week.