No, you cannot
If by "point" you mean "a projected image of the Sun that is infinitely small", created by using an optic system that is not infinitely small, and not infinitely close to the target image, then the answer is an outright: no, that cannot be done.
There are several reasons for this.
1. Every valid optic system must be reversible
If you could create an infinitely small point of light from the rays of the sun, then you would have been able to create an image of the sun from an infinitely small point of light. But an infinitely small point of light has no discernible features. You cannot create a specific image from a non-specific light source.
A consequence of that optic systems by necessity must be reversible is Conservation of Étendue.
2. Thermodynamics prevents it
Incoming light that is at least partially absorbed by a target will give energy to that target. An infinitely small target would by that heat up to an infinite amount of degrees. Since the Sun is colder than infinity degrees, this would mean an energy transfer from a colder system to a hotter. This cannot happen.
3. Every optic system no better than a pinhole camera
The most perfect lens is an infinitely small pinhole. No optic system can ever deliver a more focused image than that. The pinhole cannot deliver an infinitely small image, unless the light source is infinitely small or the pinhole is infinitely close (distance = 0) to the target surface.
Every mirrored and/or refractive surface will result in an image that is "fuzzier" than a pinhole lens, and this rule includes Frenzel lenses. An image that is less focused than a perfectly focused image cannot be smaller than the perfectly focused image. An infinitely small point image of light source must by necessity be smaller than the perfectly focused image of its light source, as when created by a pinhole. This therefore is a contradiction, and thus not possible.
xkcd what-if 145: Fire From Moonlight