Yes. And if you enter the premises after being banned, you could be arrested.
As private institutions, casinos in Las Vegas and throughout Nevada have the prerogative to ban patrons from their grounds. Typical reasons for exiling someone from a casino include that the person is being loud, intoxicated, and unruly, or the person is counting cards or even winning too much money.
Sometimes casinos will ban a patron for just the night until he/she settles down. But in other cases, casinos will ban ("trespass") a patron for a year or longer, even for life. In these cases, the trespassed patron would need to contact the casino's legal department to see if and how he/she can regain access to the casino.
A patron who goes on casino grounds after having been banned is subject to arrest for trespass. Trespass is a misdemeanor in Nevada carrying up to 6 months in jail and/or up to $1,000 in fines. Read more information on the Nevada crime of trespass. Also see our article, "How can I be arrested for trespass in Nevada?"