Matt is right about SMing being a full time job, but let's face it, not everyone is lucky enough to get that. You may find that a 'day job' is an option for you, but it's certainly dependent on your SM situation.
At a time when I was going to be between shows for a length of time, I found a 'temp' job which was supposed to last 6 weeks, to get me through a holiday period. It turned out to be a good fit, and now, more than 20 years later, I'm still in it. It has upsides and downsides. The biggest downside is that I'm not always available for the bigger scale shows which may get offered to me. An upside is that I've been able to accept any show which DOES fit my schedule regardless of the salary. this means I really can do shows 'for the love of it' and not worry about whether it'll pay my bills or not. I've been able to 'sub-in' on shows, too, which is quite convenient sometimes, for me and for the show's regular SM.
The fact that my day job is in a college theatre department makes it even nicer, as I not only get to continue to play all day, but I get to pass on what I know to younger SMs and never feel as if I'm disconnected from the real theatre world.
Not everyone gets this opportunity, either... but the fact is that there ARE jobs which can be a good fit... and it's all a matter of your situation and your preference.
Art