Principal District and Sessions Judge Sivagnanam also slapped a fine of Rs 2,000 on each of the three convicts -- Mayee, Murugapandi and Baskaran.
According to prosecution, government had given 3.13 acres of land to the tribal woman, Chokkiammal, in Kadaparikuzhi village near Periyakulam.
However, the land was allegedly encroached by the three men who also made the tribal woman a bonded labourer and work hard in her own land about a year ago.