Yes, India has been a member of the Patent Cooperation Treaty (PCT) since 7 December 1998. You can check out the PCT contracting states here. Since then it has been possible to designate India in international patent applications filed via the PCT route.
The PCT route is a convenient method of filing a patent in multiple countries at the same time. The PCT is an international treaty with 153 Contracting States, administered by World Intellectual Property Organisation (WIPO). It helps to seek patent protection for an invention simultaneously in a large number of countries. This avoids the hassle of having to file multiple applications. Since India is a member of the Patent Cooperation Treaty, it will accept PCT applications.
Also, do make sure that you check out this free e-book: A Quick Guide to Patents. Basically, it deals with basics of patent procedures.
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