You can generate a pretty convinving forward/back sweep using a few effects and automation. It is a fair bit of tweaking of knobs and automation though for what might be just a few seconds worth of audio. I'd say its rather fiddly to do.
The effects being used are stereo separation, faint reverb, volume, and a high freq filter.
Its a layer of effects, when the 'sound' is suposed to be behind you, its a bit more quiet, bit of reverb, no stereo seperation, and the filter is letting the higher sounds pass.
As the sound gets closer, raise the volume, lower the reverb, begin to add a bit of stereo seperation, and lessen up on the filter pass.
When the sound is supposed to be basically right on you, full stereo seperation, high folume, no reverb, and no filter.
For when the sound is supposed to be infront of you, lessen the stereo seperation, maybe lower the volume a bit, keep reverb off, and keep the filter off too.
While this will be fiddly, and not be your 100% golden solution, it mimics the effect quite well. Keep in mind the reverb and filter should be subtle changes, noticeable, but not like hemoraging your ears obvious that their there.
Hope this helps.