@sanaa
Sorry, the DGCA does not allow foreign pilots to work in India as First officer or as an Instructor , but expats can work as an captain till 2013 which is likely to be extended by 2 more years .
But If you have a good number of hrs [TT2000] on caravans / pc-12 or aircraft having MTOW less than 5700kg etc you can act as PIC which the DGCA allows
Good luck
mach5