Online astrophysics internship

Las Cumbres Observatory summer internships for undergraduates.
Australian Astronomical Observatory Student Fellowship Program (undergrads from Australia-summer; undergrads from UK and other countries- winter) Google Summer of Code - Internships with projects like Astropy
And yt.
Available to students all over the world.

Society of Physics Students SPS Summer Interships
Mather Policy Intern program.
Department of Energy Student Undergraduate Laboratory Internships (DOE SULI)
Astronomy research opportunities.

The Programme will support one 4 - 10 week summer internship placement, alternating annually between Cavendish Astrophysics and the Institute of Astronomy

The student should be from a non-Oxbridge higher-education institution within the UK, and should be between their penultimate and final year of undergraduate study

The Internship Programme is conducted by the Indian Institute of Astrophysics (IIA) withthe aim of promoting interest in Scientific Research among other Institutions/University/College students

Candidates selected for this programme, will work on specific projects under the supervision of the academic staff members of IIA