Take a small container like a matchbox and fill it with 50% sand and 50% seeds. Close the container and gently shake it so the sand and seeds mix. For this example I used poppy seeds, but this works for smaller seeds like basil and lettuce too.
Now you can evenly distribute the seeds either directly into the soil where you want them to grow or into a seed starting pot.
Tips for Sowing Small Seeds
If you don't have sand available finely sifted seed starting mix or compost works just as well.
I used a matchbox because that's what I saw used years ago in an old garden book, and I find them quaint. But a mint container like the ones I use to collect seeds, salt shaker, and spice jar would work as long as the openings are big enough for the seed to pass through.
Benefits of Sowing Small Seeds This Way
Unless you're sitting there placing each tiny seed into your seed starting mix individually it is almost impossible to get an even distribution of small seeds. Small seeds will clump together and compete for light and space as they grow. You'll end up with lots of weaker seedlings instead of strong and healthy ones. Mixing the seeds with something like sand prior to sowing ensure the seeds have enough space to grow. You can sow small seeds using this old gardener trick when starting seeds indoors too and when you're direct seed sowing after all dangers of frost have passed in your area.