Yes! If you had any kind of self-employed income in 2019 or 2020 (as long as you began receiving that before Feb 15, 2020), you can still receive PPP funds. That includes any 1099, self-employed or sole-proprietor income.
You receiving any other form of income (eg from investments, an employer payroll, etc) does not disqualify you from applying for PPP, as long as you have separate self-employment income.