I'm not sure what you mean.
If you mean literally -- can you configure a separate AP using a wireless connection instead of a wired connection, then I'd say maybe -- this would entirely depend upon the AP (whether or not it had wireless and wireless administration enabled out of the box without security -- really they shouldn't as this is not secure). You'd generally be much better off doing such things with wired connections -- they would help you diagnose the wireless connections without going through the wireless part itself to do so.
If you mean to ask is there a wireless device that can double as both a wireless client and a wireless server, then the answer is yes -- there are some such devices on the market, although none that I know of are "cards".
Here's one such device:http://www.dlink.com/products/?sec=0&pid=346
If you can sacrifice portability, then a Linksys WRT54GL with DD-WRT can also do this and more.