Then you will probably need an additional visa. Either email Icelandic Immigration using the above website's
contact form, or contact the Danish Embassy in New Delhi or the Italian Consulate in Calcutta if you're still in India, as both handle visas on Iceland's behalf.
The visas may overlap or the Iceland visa may be limited to your business trip only, I don't know, but I'm sure Immigration or the contacts given will be able to advise.