I think you're talking about lows, kinda 100-200Hz range.
It it a whole band of frequencies, there will be multiple frequencies in there (As opposed to sub-bass, which only really has room for one: the lower the frequencies the more they need to be spaced out) so I think using sine waves sounds a bit overly complicated.
As long as you start making your bass with a note in the bottom octave (E1-E2) you should have some content in that area.(Unless you decide to highpass your bass, lol)
If you find that you don't have enough, grab an EQ and boost that region. One thing to try is to put a compressor over the EQ when boosting to keep the volume consistent, which always tricks people into thinking they're improving the timbre of the sound when in actual fact they're just making it louder overall.