The couple have been commissioned by Smartwater to create a viral video that mocks "paparazzi and tabloid interest in Jennifer's life" and rumours of a possible pregnancy, a source told Page Six.
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Theroux is co-writing the short film with Aniston, who is also slated to direct the project.
Production is expected to begin next month.
Representatives for Aniston and Theroux have not made an official comment on the possible project.
Aniston recently shot down rumours that she and Theroux will tie the knot in Crete in July.
The pair are thought to have begun dating last spring.
Watch Justin Theroux and Jennifer Aniston in a Wanderlust trailer below:
