I'm presuming you've already raised the handlebar as much as the obvious adjustments will allow.
There are solutions, but precisely which one depends on the style of the of the headset. If you have an old style threaded headset then you need to replace the quill/stem with a new, taller one. You can often, at the same time, get one that changes the "reach" of the bar, if you wish. (But unfortunately the available selection of different old-style stems is small and getting smaller daily.)
For a newer threadless headset, you can get an extension to go on top of the steering tube to allow the stem to be mounted higher up, and/or you can replace the stem with one that rises at a steeper angle.