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Vin Diesel just landed a big win in a sexual assault lawsuit filed against him ... a judge threw out the case before it went to trial.

As we previously reported ... Asta Jonasson , a former assistant on the "Fast Five" set, sued Diesel for actions she alleges he committed against her in Georgia in 2010. Getty

According to the judge's ruling, obtained by TMZ, the case has been tossed out because it wasn't filed in Georgia, where the alleged incident was said to have taken place. In essence, the judge said Jonasson couldn't apply California laws to acts that allegedly happened in Georgia.

Remember ... this is the same case where Diesel's powerhouse attorney Bryan Freedman -- who also reps Justin Baldoni in his ongoing case with Blake Lively -- was accused of threat

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