Dear Mateusz88,
you can work out the math and find out that the formula you are looking for is the following:
x = (R+a*sin(n*t*s))*cos(t*s)
y = (R+a*sin(n*t*s))*sin(t*s)
where:
R is the Radius
a is the Amplitude
n is the number of sines functions along the circle
t is the time
s is the speed
At the end, remember to add the center of the circle
You can either build the formula in your blueprint, or use a custom Math expression node, like in the following screenshot:
And this is the final result:
If you need other clarifications, I will be glad to help.