Short answer. Yes, if you cannot recover the property itself from the buyer. Article 767 gives you the right to demand from the donee the value of property he alienated that you cannot recover from third persons, or the sum for which it was mortgaged, valued as of the time of the donation.
What the law says
the donor shall have a right to demand from the donee the value of property alienated which he cannot recover from third persons, or the sum for which the same has been mortgaged. The value of said property shall be fixed as of the time of the donation.
Civil Code, Article 767 — Donor's Claim For Value. Read the full provision →
The remedy shifts from the property to its value
Article 767 is built around exactly the gap you are facing: the donated property is gone from your reach, but the donee should not simply walk away unaffected. The article provides that the donor shall have a right to demand from the donee the value of property alienated which he cannot recover from third persons. When getting the actual property back from whoever now holds it is not realistic, the law converts your claim into a claim for its value, payable by the donee who sold or otherwise alienated it.
Why the timing of the sale matters to your situation
You mention that the sale to the third party happened before your revocation complaint was annotated in the Registry. Annotation is generally what puts later buyers and interested parties on notice of a pending claim against the property, so a sale completed beforehand often leaves the buyer better positioned to resist a claim for the property itself. If that is the case here, and the property genuinely cannot be recovered from the buyer, Article 767 is the provision that lets you pursue the donee for its value instead of leaving you without any remedy at all.
The article also covers mortgaged property
Article 767 is not limited to outright sales. It also addresses property the donee mortgaged rather than sold: the donor may demand "the sum for which the same has been mortgaged." If, instead of selling the property outright, the donee had used it as collateral for a loan, your claim against the donee would be for the amount of that mortgage rather than the property's full value, reflecting what the donee actually obtained from encumbering it.
How the value is fixed
The article settles a question that could otherwise be disputed: at what point in time is the property's value measured? It answers plainly: the value of said property shall be fixed as of the time of the donation. This means the relevant figure is not what the property was worth when the donee sold it, nor what it is worth today, but its value back when you originally made the donation. If the property has appreciated or depreciated significantly since then, that later change in value does not enter into what you can claim from the donee under this article.