I have client who have purchased a salesforce licence. He provided me production org. When I asked for sandbox he replied that there is not sandbox when he purchased this licence. Is there any licence which do not contain sandbox. With out sandbox where do we code and add to the production org. Can anyone here help me out to get the solution. If sandbox is there then how can we get it? Please do help me.
Sandboxes aren't part of the CONTACT, GROUP and PROFESSIONAL Editions. In the Help (Sandbox Overview) you can see they are only available for: Enterprise, Performance, Unlimited, and Database.com Editions
But in your case it looks like the customer doesn't know how to create a sandbox. Therefore just create a new sandbox..
To find out which edition you are using, visit the "Home" tab and check your browser's "title" bar.