I can’t find anything specific that says you’re not allowed to throw/sandbag, etc. but I think the 6th bullet of the Owner’s Charter would allow the league to punish them:

“We understand the importance of a football pyramid that rewards success on the pitch, upholds promotion and relegation and qualification for other competitions by current sporting merit.”

I think some people forget that these are athletes that have had one word seared into their brains since they were 5 - “WIN”.