Tenniswish explains rules on scouting.
The NCAA does prohibit schools from paying any expenses for a coach to scout upcoming opponents.
In basketball, football and women's volleyball, off-campus, in-person scouting is strictly prohibited except at tournaments where a team is participating and then coaches can watch other games.
In sports other than those three, coaches wouldn't be able to receive any money to cover expenses. Furthermore, if a coach is traveling as part of the team or on a recruiting trip, then the coach is not allowed to scout during that trip. See NCAA Bylaw 11.6.2.
I guess if a coach wanted to drive across town and watch a match, he/she could, but this rule really protects the coaches from themselves since not being able to pay for scouting trips keeps heads coaches from sending their assistant coaches all over the place to scout opponents.