Dear Satish,
If you are a law graduate, you can pursue a one-year diploma in Labour Laws from ILI Delhi. If not, Madurai Kamaraj University and Annamalai University are offering the Diploma in Labour Laws for one year and six months, respectively. I am currently enrolled in the same program at Madurai Kamaraj University, which is actually a one-year PG diploma in Labour & Administrative Laws.
Regards,
Sanjeev Kaushik