Hi @Vinod Shinde
Thank you for posting your question on Microsoft Q&A and for using Azure services.
From what i understand you are trying to restrict the access to certain Partition Key only using SAS. In Azure Cosmos DB Table API Shared access signature as you mentioned above is not supported. It is only supported with table storage.
You cannot restrict access to certain partition in Cosmos DB Table API using SAS, but you can restrict the access to users by applying the following steps:
Creating a custom Azure Active Directory role for the users whom you want to restrict access. The custom Active Directory role should have fine-grained access level to operations using Azure Cosmos DB's granular actions.
Disallowing the execution of non-data operations with keys. You can achieve this by restricting these operations to Azure Resource Manager calls only.
Hope that helps.