Sorry, no online dictionaries contain the exact phrase the opposite of sine qua non.
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Reverse dictionary results:
1. inessential
2. nonessential
3. extraneous
4. optional
5. accessory
6. alternative
7. arbitrary
8. false
9. generalized
10. non-verbal
11. noncharacter
12. noncommital
13. nonjudgemental
14. nonmoral
15. nonnecessity
16. nonnovel
17. nonpractising
18. nonrational
19. nonroutine
20. nonsentence
21. nonstandard
22. nonstop
23. nonword
24. proprietary
25. unspecialized
26. unwhite
27. what not
28. whatnot
29. anarthrous
30. anomalistic
31. asemantic
32. atypical
33. disproportionate
34. facultative
35. floating
36. headless

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