It’s perfectly fine to freeze pre-marinated meat for later cooking, provided you’re using fresh meat that’s never been frozen (refreezing defrosted meat deteriorates its quality and invites bacterial contamination). Defrost marinated meat in the refrigerator, and use within a day to avoid overmarination.
Non Cognomina offers some tips for both freezing and defrosting marinated meats:
Freezing: Place marinated meat in Ziploc-type freezer bags, squeeze out as much air as possible and lay bags flat on a sheet pan in the freezer until meat is completely frozen. Then stack bags in a flat container or put them in a larger bag to protect them from breakage.
Defrosting: thaw in a glass or plastic bowl in the fridge, in order to contain any leakage.
Board Links: Is it OK to Freeze Marinated Meat ?