Hi Rohit,
If you have a new template and set the SDS as main version, the system will consider:
For Country US the standard setting sends the new version only on the next delivery to the customer.
However for European countries you can configure subsequent shipping using FM CVE8_RDO_SUBSEQ_REQ_CREATE in " Assign Check and Subsequent Shipping Functions". in SPRO.
This will trigger subsequent shipping and resend SDS to all the customers in the past 12 months using SUB_CALL