What is your objective? I think you may be constructing scenarios or steps that won't lead you to where you want to go.
Can you sell your condo to your wife? Yes. If she can go out and qualify for financing on her own, she can buy it from you. If you simply want her to have full ownership and you're willing to stay on the mortgage, you can just deed your interest in it to her.
I'm not a lawyer, so this isn't legal advice. For that, you need a lawyer.
Can you buy another property on your own? Probably. State law varies somewhat on types of ownership. But, sure, there's some way that you could purchase a property on your own. You'd have to qualify on your own, though. And the uncertainty is whether--even though your wife would be sole owner of the condo and you'd aim to be sole owner of the other property--whether lenders would see the marriage as a connection between the two of you, requiring some sort of consideration of the other's income, assets, liabilities, etc.
However, there are strategies that could be used. For instance, a land trust might be used to purchase a new property without any immediate involvement from lenders or others.
Check with a lawyer.
But, again, depending on what your ultimate objective is, the strategy you've proposed probably isn't the best one.
Hope that helps.