Nopparat Benjawatananun, director-general of the office, said on Thursday the nun was based at Wat Tham Khwan Muang in Sawi district of Chumphon province and the office had asked the abbot of the temple to tell the nun to adhere to the sufficiency way of life.
Mr Nopparat said a disciple had bought the Porsche and donated it to the nun. He urged Buddhists to make more appropriate donations to monks, novices and nuns - they should not buy products like luxury cars.
He said Buddhist monks, novices and nuns must live in a sufficiency fashion and behave respectably.
The issue became the talk of the town after a Facebook user, identified in Thai as Samart Thongmee, recently posted a picture of the white-clad nun in the driver's seat of the white Porsche, apparently a Cayman series priced at about 6.3 million baht.