Yes there is. With the audio (or video) track highlighted, hit the 8 or 2 on the keypad and each hit will move the event up or down by one track. Note that this requires a keypad - it doesn't work on a standard laptop keyboard that doesn't also have a keypad (not on my laptop anyway).
If you go to the Help menu in your Vegas Pro, you should see a selection to keyboard shortcuts. If it's not there, select the user manual and there a chapter in the manual called Keyboard Shortcuts. The above shortcut and many, many more are all listed there.
@Dexcon it should work on a laptop without a keypad if "num lock" is turned on using the "8" and "k" keys. Usually on laptops without a keypad, when num lock is turned on 789 is 789, uio is 456, jkl is 123.
@jetdv ... thanks for the suggestion but it doesn't work on my Dell 7580 (i7-8565U) laptop. In any event, I am puzzled by the OP's concern because when moving an event up or down a track, the exact edge of the event is highlighted by a vertical orange bar so that the left position is marked right down the timeline when moving the event between tracks - assuming that Enable Snapping is enabled.
I can see it moving if it's not associated with a video too and snapping is turned off. I've not seen an issue with snapping turned on but I often just use "2" to move it down a track if that's what I want and 1/3 to move it left or right frame by frame.