you could use UIScrollViews contentOffset-property, since UITableView inherits from UIScrollView. Here is a link to the docs:
https://developer.apple.com/Library/ios/documentation/UIKit/Reference/UIScrollView_Class/Reference/UIScrollView.html#//apple_ref/occ/instp/UIScrollView/contentOffset
Essentially you just set a Point to define the X- and Y-Offset. So if you want the TableViews content to be offset by 100pts from the top, you would set
myTableView.contentOffset = CGPointMake(0, -100); //(edited in response to Lavvo's comment)
and thats it!
EDIT: Since its a property, there is a chance that you can set it in Interface Builder, but i cant check that right now. If so, its probably in the "Sizes"-Panel, i would guess.