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Yes it is possible to achieve your requirement. There are multiple options available to do this:
1. You can post the submission data to your own page by enabling the "Send Post Data" in your form preferences and then redirect to your own thank you page where you can read the submission data and save it in your SQL Server DB. The following guide should help you: http://www.jotform.com/help/213-Send-POST-Data-From-JotForm-Using-PHP-in-Custom-Thank-You-Page
2. You can take advantage of our Zapier integration app as well. Take a look at here: http://apps.jotform.com/app/zapier_integration
You may also like to check this app which should help you achieve your requirement: https://zapier.com/zapbook/jotform/sql-server/7564/save-jotform-submissions-to-sql-server/
3. You can directly download the SQL file of your submissions and import them in your database. Please take a look at the following app: http://apps.jotform.com/app/ms_sql_server_export
Hope this helps.
Do get back to us if you have any questions.