Hi @Rohit Kulkarni ,
Thanks for using Microsoft Q&A !!
Unfortunately, you cannot use Snowflake as a Sink if snowflake is on AWS. Currently, it supports writing to snowflake on Azure only. Please refer to the documentation.
Yes, regarding your SAS token, that is expected as you need SAS token for any specific resource to create a linked service against that resource.
Please let me know if you have any other questions.
Thanks
Saurabh