Read this first: Moving to & Property in Goa.

People looking for advice in this Moving to Goa sub-forum are kindly advised to check the following threads on all the legal and practical aspects first, in IndiaMike's Property in India forum. While massive and naturally not always consistent, they will give a good idea of all the (im-) possibilities involved, not only regarding property but addressing wider issues of immigration as well, and many queries will already have been answered there:

Foreign owned property in Goa, (Part One)
Foreign owned property in Goa, (part Two)

For stipulations regarding immigration to India, see also

http://meaindia.nic.in/ (Ministry of External Affairs)
http://mha.gov.in/ (Ministry of Home Affairs)
http://immigrationindia.nic.in/ (Ministry of Home Affairs, Bureau of Immigration)

And consult with your own Indian embassy and your Ministry of External Affairs.