Dear Khalsa Ji,
As I know, before the entry of Aryans into India, the Dravidian languages were spoken by the inhabitants of India; Tamil language is one of the many Dravidian languages presently spoken in India. Sanskrit has borowed a lot from these languages.
The route that Aryans have followed doesnot have hard Dee where one has to turn the tounge upward as in Ladkee (girl) or Ladka (boy). These sounds and many more in Sanskrit and its derivatives have been borrowd from Dravidian Languages. The root or mother language of Latin and Sanskrit is the same. That is why Sanskrit is included in Indo Europian group of languages.
Tamil could not be linked to any language that existed outside India. It is truly Indian language that has origin and history of evolution in India. As I know, there is only one word which is similar in Tamil and Hybrew - the one used for pea{censored}.
Some of the seals of Harrapan civilisation have been deciphered using Dravidian languages, indiacating that it prevailed in India much before the arrival of Sanskrit.
With love and respect for all
Amarpal Singh
P.S. The paper connecting Harapan seals with Dravidian languages had appeared long back in Scientific American. I do not have the reference.