Hi Harshad_919,
Thanks for contacting us with your question.
There is no limit for data number in sankey. The only things that limits you are performance issues and too little space, and the second thing is your case. You added too many points and there is simple not enough space to display them all. I have reduced your data significanlty and increased chart height. Take a look at the results:
https://jsfiddle.net/BlackLabel/fy69q2gc/
I think you should reconsider your data structure, because it would be really hard to show that many points. Perhaps you could split your data by regions or some other criteria and show multiple charts instead of big one? You could also try to increase chart height even further and use some sort of scroll on your container.
Let me know if you have any further questions!
Regards!