Regulate how exactly and what would it help with? Accounting requirements can help with things like money laundering and fraud. I am not certain of what measures would help with abuse there. Not saying it is impossible but we should know what we are doing.
Take a sport manager. If the manager give their athlete drugs to improve performance in order to boost their own status or profit, then clearly something is wrong with the incentive structure. Managers could be held to a higher legal standard and liability, require a license like accounting, and we could fund police investigation when abuse is suspected. If the problem still remain we could regulate how managers are allowed to profit from athletes, removing some of those incentives for abuse. Going even further and more restricted, managers could be government appointed rather than hired, requiring that managers go through a strict government process.
I am sure there are even more ways that I can't personally think of, and obviously some would not be culturally accepted.
