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Sometimes your Magento Theme is a 2 column layout but your cart page is just 1 column, by default. So, if you are looking to change cart page layout or want to add a left / right sidebar on your cart page, here is how you do it. Magento will set the template for the cart in checkout.xml layout file under <checkout_cart_index> section.
To change cart page layout, look for the following code :
You can change ‘1column’ layout to required ‘2columns-left’ or ‘2columns-right’ layout. If you are using a custom theme, then you need to use the following code in local.xml
... ... page/2columns-left.phtml